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Measuring Life Expectancy and Lifespan Variation Inequalities at Older Ages

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Measuring Life Expectancy and Lifespan Variation Inequalities at Older Ages Are Ageing Societies Ageing Equally? Measuring Life Expectancy and Lifespan Variation Inequalities at Older Ages Seaman, Rosie1* and Nepomuceno, Marília R.1 1Max Planck Institute for Demographic Research, Rostock, Germany Abstract Socioeconomic inequalities in average life expectancy are considered to be the strongest reflection of inequalities in health and life chances but the WHO recommend that the distribution of health across all individuals also be monitored. This prompted studies into variation in age at death. Higher variation in death reflects greater heterogeneity or greater inequality. International evidence shows that the most deprived groups experience a double burden of mortality inequality: lower life expectancy and higher variation. At the national level, older ages have shown increasing variation in age at death. It is not clear if this national level trend is consistent across all socioeconomic groups. Measuring life expectancy and variation at older ages is important for understanding the extent to which ageing societies are ageing equally. We investigate life expectancy and lifespan variation changes between 1981 and 2011, at age 50, age 65 and age 75, using area-level deprivation to stratify the whole population of Scotland. Keywords: heterogeneity in age at death, lifespan variation gap, socioeconomic inequality, inequality and ageing Acknowledgements and funding This work was supported by the European Research Council (grant number 716323). We are grateful to the Census and vital statistics customer service teams at National Records of Scotland for providing data. * Corresponding author: [email protected] 1 Background 2 Socioeconomic inequalities in life expectancy have been documented in every developed country 3 where measurement has taken place. A gradient in life expectancy is found whether education, 4 income, or occupation are used as a proxy measure for socioeconomic inequality with trend studies 5 indicating that the life expectancy gap between the most and least advantaged groups has widened 6 in developed countries (Auger, Harper and Barry 2013; Martikainen, Valkonen and Martelin 2001; 7 Tarkiainen et al. 2012). Although inequalities in life expectancy are considered to be the strongest 8 reflection of inequalities in health and life chances, recent attention has been paid to variation in age 9 at death. 10 Higher variation in death reflects greater heterogeneity or greater inequality. It is also in line with 11 the WHO recommendation to measure the distribution of health across all individuals (World Health 12 Organistation 2000). National variation trends have been investigated for many countries (Seaman, 13 Leyland and Popham 2016; Vaupel, Zhang and van Raalte 2011). In general, the desired correlation 14 between increasing life expectancy and decreasing variation in age at death has been achieved by 15 most countries. This is largely due to falling premature mortality rates historically outpacing falling 16 mortality rates at older ages (Vaupel et al. 2011). 17 In contrast to national trends, socioeconomic trends within countries are not consistently following 18 the desired correlation: the most deprived groups experience increasing life expectancy alongside 19 stagnating or even increasing variation in age at death (Brønnum-Hansen 2017; van Raalte, 20 Martikainen and Myrskylä 2014). Lower life expectancy and higher variation in age at death for the 21 most deprived socioeconomic groups can be considered as a double burden of mortality inequality. 22 While increases in life expectancy come from reducing mortality rates at any age, variation in age at 23 death decreases if there is a balance between avoiding premature deaths and avoiding older age 24 deaths. The distribution compresses if premature mortality rates are decreased over time. The 25 distribution expands when deaths at older ages are delayed (Vaupel et al. 2011). Therefore, 26 increases in life expectancy could be expected to continue with increased survival at older ages but 27 decreases in variation may be more uncertain. Increasing variation at older ages can on one hand be 28 considered a consequence of population ageing. On the other hand, if increases at older ages are 29 patterned by socioeconomic deprivation it may indicate that ageing is becoming an increasingly 30 unequal process. Regardless, measuring variation has implications in terms of future planning, 31 pensions and health care (van Raalte et al. 2014). 32 When looking at variation conditional upon survival to age 75 for national populations (Engelman, 33 Canudas-Romo and Agree 2010) found the level to be stable with some small increases since 1950. 34 Several studies have also documented socioeconomic inequalities (Sasson 2016; van Raalte et al. 35 2012; van Raalte et al. 2014) but these studies paid limited attention to inequalities at older ages. 36 We consider the life expectancy gap and the lifespan variation gap conditional upon survival to age 37 50, age 65 and age 75 between 1981 and 2011. We use population and mortality data that covers 38 the entire population of Scotland (c.a. 5 million) stratified by a validated measure of area-level 39 deprivation(Carstairs and Morris 1989). The next steps of this research will involve age-and cause 40 specific decomposition. 41 1 42 Data and methods 43 We use individual level mortality data and area-level population estimates that were obtained via a 44 commissioned request from National Records of Scotland (National Records of Scotland), alongside 45 the Carstairs score of area-level deprivation that is freely available to access online (Brown et al. 46 2014). After matching, these data were used to construct deprivation specific period life tables for 47 each census year, for males and females separately. 48 Population data are for each part-postcode sector in Scotland at each census year between 1981 and 49 2011, ensuring the most robust population estimates available that include the whole population. 50 There are approximately 1,010 part-postcode sectors in Scotland, with an average population size of 51 5,000. Population estimates obtained were stratified by single year of age and sex. 52 Mortality data include all individual deaths that occurred in Scotland in the years centred around 53 each census year. Each individual death record contains geographical information on place of usual 54 residence that we used to match to population estimates and the deprivation score data. 55 Traditional stratification measures such as income, occupation or education are often only available 56 for certain ages of the population meaning age truncation is required. Area-level measures of 57 deprivation are a unique alternative that overcome this limitation as they are applicable to the 58 entire population and are derived from routinely collective, administrative data (Kearns, Gibb and 59 Mackay 2000). In this study we use the Carstairs score, a standardised z-score derived from four 60 variables (overcrowding, male unemployment, no car ownership and low social class) that was 61 constructed specifically for measuring health inequalities (Carstairs and Morris 1989). 62 Smoothing and extrapolation 63 Census population estimates obtained were available up to different open-ended age intervals; 1981 64 was 85+, 1991 was 90+, 2001 was 85+ and 2011 was 95+. According to the 2011 Scottish female 65 period life table, over 45 percent of women survived to ages older than 85 (Human Mortality 66 Database 2018) . Given the likely differences in survivorship by deprivation quintile, using an open- 67 ended age interval of 85+ risked introducing biases in lifespan variation according to the proportions 68 surviving to age 85. Although a mortality rate for the entire population of Scotland was available 69 from the Human Mortality Database (HMD) up to an open-ended age interval of 110+ this could not 70 directly be used to derive any information on socioeconomic deprivation. Instead we used the HMD 71 smoothing method, a Kannisto logistic model, to extrapolate mortality rates to age 110+ for each 72 year, sex, and quintile separately. We report results using an open age category of 110+. 73 Specifically, we apply equations 64 and 65 from the HMD Methods Protocol version 6 (Wilmoth et al. 74 2017), but modified to use information from ages 75+ rather than 80+. 75 Measures of lifespan variation † 76 We measure inequality in age at death using 푒푥 . This is the weighted average of remaining life 77 expectancy at each age, weighted by the number of lifetable deaths at each age. It has an intuitive 78 public health interpretation: the average number of years remaining at death and measures life 79 years lost when a death occurs (Vaupel and Canudas Romo 2003). The high correlation between 80 alternative indices of lifespan inequality suggests that the overall conclusions would not have 2 81 changed had an alternative measure been used (Németh 2017; van Raalte and Caswell 2013; Vaupel 82 et al. 2011; Wilmoth and Horiuchi 1999). 83 Preliminary descriptive results 84 Figure 1 shows remaining life expectancy for ages >50 to 110+ plotted against disparity in age at 85 death for ages>50 to 110+. It compares the most and least deprived quintile in 1981 and 2011. Three 86 ages are highlighted: 50, 65 and 75. 87 88 Figure 1 Relationship between remaining life expectancy and variation in age at death conditional 89 upon survival to ages >50, for most and least deprived quintile. 90 The overall patterns for males and females are similar but females have slightly higher remaining life 91 expectancy and slightly lower variation in age at death. The most striking finding in this figure is the 92 change between 1981 and 2011 for the least deprived quintile that is not present for the most 93 deprived quintile. Between 1981 and 2011, we see that remaining life expectancy for the least 94 deprived quintile has increased more than for the most deprived. Variation has decreased for those 95 age 50 from the least deprived, stayed constant for those age 65 and has slightly increased for those 96 age 75.
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